1 . A large cube is formed from the material obtained by melting three smaller cubes of 3,4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
- A. 2 : 1
- B. 3 : 2
- C. 25 : 18
- D. 27 : 20
- D. None of these
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